JP7221602B2 - Sticking detection device for oil pump - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil pump sticking detection device for detecting whether or not an oil pump capable of switching between a full discharge state and a partial discharge state is stuck.

An automatic transmission for a vehicle (for example, a stepped automatic transmission (Step AT), a continuously variable transmission (CVT), etc.) is equipped with an oil pump that is driven by engine power and discharges high-pressure oil. Various functions such as gear shifting and forward/reverse switching are realized by regulating and supplying the discharged high-pressure oil.

On the other hand, in recent years, there has been a demand for reducing the load (loss) of the oil pump due to the demand for improved fuel efficiency of vehicles. As an oil pump that can reduce such a load, for example, an oil pump that has a function of switching the discharge state (discharge flow rate) using a switching solenoid, that is, two discharge ports are completely blocked from the intake port. An oil pump (variable displacement pump) that can be switched to a full discharge state (full capacity operation state) or a half discharge state (half capacity operation state) in which one of the two discharge ports is connected to the suction port is in practical use. has been made

By the way, if such an oil pump is stuck in the full discharge state, it will be impossible to reduce the load (that is, improve the fuel efficiency). On the other hand, if the oil is stuck in the half-discharge state, there is a possibility that the required oil flow rate cannot be supplied to the automatic transmission or the like. In view of this, Patent Literature 1 discloses an abnormality detection device for a hydraulic circuit that detects sticking of switching means for switching between a full discharge state and a half discharge state of an oil pump.

More specifically, this abnormality detection device includes a switching control unit that performs switching control to switch to the half-discharge state, and a pressure regulating unit that performs pressure regulating control so that the target line pressure is higher than the maximum discharge pressure in the half-discharge state. and a determination unit that determines that the switching solenoid valve and/or the switching valve is stuck abnormally in the full discharge state when the line pressure detected by the line pressure detection sensor is higher than the maximum discharge pressure in the half discharge state. ing. That is, in this abnormality detection device, the target hydraulic pressure for diagnosis is increased to a value that cannot be discharged in the half-discharge state, and when the actual pressure increases to the target hydraulic pressure for diagnosis (that is, a value that cannot be obtained in the half-discharge state), Determined as abnormal (the oil pump is stuck in the full discharge state), otherwise determined as normal.

JP 2017-106581 A

As described above, according to the abnormality detection device described in Patent Literature 1, control is performed to switch the oil pump to the half-discharge state when it is determined that the oil is stuck. Here, for example, when the accelerator pedal is stepped on substantially at the same time as the end of the fixation determination, the engine torque (that is, the input torque of the transmission) increases and the gear ratio is downshifted to the low side. The hydraulic pressure required for the secondary pulley that constitutes the transmission increases. Then, the required oil flow rate increases according to the increase in the required hydraulic pressure of the secondary pulley and the change in the volume of the hydraulic chamber of the secondary pulley. However, if the required oil flow rate cannot be covered at that time, there is a risk that an undershoot will occur in which the actual oil pressure drops below the required oil pressure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. It is an object of the present invention to provide an oil pump sticking detection device capable of suppressing an undershoot in which an actual oil pressure drops below a required oil pressure immediately after completion of sticking determination.

An oil pump sticking detection device according to the present invention includes an oil pump that pressurizes oil sucked from a suction port and discharges it from a plurality of discharge ports, and the discharge state of the oil pump is determined as a high-pressure oil passage in which all of the plurality of discharge ports are connected. A full discharge state in which communication is performed, or a partial discharge state in which some of the plurality of discharge ports are in communication with the high-pressure oil passage and some of the other discharge ports are in communication with the suction port of the oil pump. a discharge state switching means for switching; a target oil pressure setting means for setting a target oil pressure which is a control target value of the oil pressure in the high pressure oil passage; a fixation determination means for determining whether or not the oil pump is stuck in the full discharge state or the partial discharge state based on the hydraulic pressure regulated by the pressure means, and determines whether the oil pump is stuck. When executing the sticking determination, the target oil pressure setting means uses, instead of the target oil pressure, a diagnostic target oil pressure for determining whether the oil pump is stuck in the full discharge state or the partial discharge state, A value higher than the maximum pressure in the partial discharge state is set, the discharge state switching means performs control to set the discharge state of the oil pump to the partial discharge state, and the pressure regulating means adjusts the oil pressure to match the target oil pressure for diagnosis. and the fixation determination means determines whether or not the oil pump is stuck in the full discharge state based on the relationship between the oil pressure after the control for the partial discharge state and the maximum pressure in the partial discharge state. is determined, and when execution of the sticking determination is completed, the target hydraulic pressure setting means sets the control target value of the hydraulic pressure of the high-pressure oil passage higher than the normal target hydraulic pressure set based on the operating state of the vehicle. It is characterized by setting a target hydraulic pressure at the end of determination.

According to the sticking detection device for an oil pump according to the present invention, when execution of the sticking determination is completed, the control target value of the oil pressure of the high-pressure oil passage is set to a target oil pressure at the end of determination that is higher than the normal target oil pressure. set. That is, the target hydraulic pressure is raised above the normal value set based on the operating state of the vehicle. Therefore, for example, when the accelerator pedal is stepped on substantially at the same time as the end of the fixation determination, the engine torque (input torque) increases and the required oil pressure of the secondary pulley increases due to the downshift to the low side of the gear ratio, and Even if the required flow rate of oil increases according to the change in the volume of the hydraulic chamber of the secondary pulley, it is possible to suppress an undershoot in which the actual oil pressure drops below the required oil pressure immediately after completion of the sticking determination.

Further, in the oil pump sticking detection device according to the present invention, the target oil pressure setting means further sets the pulley target oil pressure, which is the control target value of the oil pressure of the pulleys constituting the continuously variable transmission, and the execution of the sticking determination is started. It is preferable that the target hydraulic pressure setting means sets, as the control target value for the hydraulic pressure of the pulley, the determination pulley target hydraulic pressure that is higher than the normal pulley target hydraulic pressure that is set according to the engine torque.

In this case, after the sticking determination is started, the determination pulley target hydraulic pressure higher than the normal pulley target hydraulic pressure is set as the control target value of the hydraulic pressure supplied to the pulley. That is, the pulley target hydraulic pressure is raised above a normal value set according to the engine torque (input torque). Therefore, for example, when the accelerator pedal is stepped on substantially at the same time as the end of the fixation determination, the engine torque (input torque) increases and the required hydraulic pressure of the secondary pulley increases due to the downshift to the low side of the gear ratio, and Even if the required flow rate of oil increases according to the change in the volume of the hydraulic chamber of the secondary pulley, it is possible to suppress an undershoot in which the actual oil pressure drops below the required oil pressure immediately after the fixation determination is completed.

In the oil pump sticking detection device according to the present invention, the pressure regulating means performs feedback control based on the deviation between the target hydraulic pressure and the hydraulic pressure of the high-pressure oil passage, and adjusts the hydraulic pressure of the high-pressure oil passage to match the target hydraulic pressure. If the pressure regulating means is controlling the discharge state of the oil pump to be in the partial discharge state when executing the fixation determination for determining whether or not the oil pump is stuck, the target hydraulic pressure for diagnosis When the accumulation operation of the integral term that adjusts the control value according to the time integral of the deviation between the pressure and the oil pressure is temporarily stopped, and the oil pressure drops below the target oil pressure at the end of the judgment after the execution of the sticking judgment is completed. Then, it is preferable to resume the stopped accumulation operation of the integral term.

In this case, when the fixation determination for determining whether or not the oil pump is stuck is being performed, if control is being performed to set the discharge state of the oil pump to the partial discharge state, the target oil pressure for diagnosis and the oil pressure Accumulation operation of the integral term that adjusts the control value according to the time integral of the deviation is temporarily stopped. The operation of accumulating the integral term that has been performed is resumed. Therefore, after the sticking determination is completed, the integral term accumulation operation (hydraulic feedback) does not resume until the hydraulic pressure drops below the target hydraulic pressure at the end of determination. It can prevent unnecessary accumulation. As a result, it is possible to suppress the undershoot of the hydraulic pressure immediately after the end of the fixation determination.

Further, in the oil pump fixation detection device according to the present invention, when the deviation between the oil pressure and the target oil pressure at the end of determination becomes equal to or less than a predetermined value, or after execution of the fixation determination is completed, the pressure regulating means It is preferable to restart the stopped operation of accumulating the integral term when a predetermined period of time has elapsed.

In this case, when the deviation between the hydraulic pressure and the target hydraulic pressure at the end of the determination becomes equal to or less than a predetermined value, or when a predetermined time elapses after execution of the sticking determination is completed, the accumulation of the integral term that has been stopped. Operation resumes. Therefore, even if the hydraulic pressure does not drop below the target hydraulic pressure at the end of determination, the operation of accumulating the integral term can be resumed. Therefore, it is possible to prevent the operation of accumulating the integral term from continuing to stop (that is, from being unable to restart the hydraulic feedback).

In the oil pump sticking detection device according to the present invention, the target oil pressure setting means sets the oil pressure of the high-pressure oil passage when the predetermined time elapses after the operation of accumulating the integral term by the pressure regulating means is resumed. It is preferable to return the control target value from the determination end target hydraulic pressure to the normal target hydraulic pressure.

In this case , the control target value of the hydraulic pressure of the high-pressure oil passage is returned from the target hydraulic pressure at the end of determination to the normal target hydraulic pressure after a predetermined time has elapsed after the operation of accumulating the integral term is restarted. Therefore, after suppressing the undershoot of the hydraulic pressure, it is possible to smoothly shift to the normal control.

In the oil pump sticking detection device according to the present invention, the target oil pressure setting means sets the control target oil pressure of the pulley when the predetermined time has elapsed after the accumulation operation of the integral term by the pressure regulating means is resumed. It is preferable to return the value from the determination pulley target hydraulic pressure to the normal pulley target hydraulic pressure.

In this case , when a predetermined time elapses after the operation of accumulating the integral term is resumed, the control target value of the hydraulic pressure supplied to the pulley is returned from the judging pulley target hydraulic pressure to the normal pulley target hydraulic pressure. Therefore, after suppressing the undershoot of the hydraulic pressure, it is possible to smoothly shift to the normal control.

The oil pump sticking detection device according to the present invention further includes sticking determination prohibiting means for interrupting execution of sticking determination for determining whether or not the oil pump is stuck, and the sticking determination prohibiting means drives the oil pump. When the engine speed is above a predetermined speed, when the oil temperature is below a predetermined temperature, and when the vehicle speed is below a predetermined speed, the average vehicle speed over a predetermined period and the maximum vehicle speed over a predetermined period are calculated. If the deviation from the value and the minimum value is a predetermined speed or more, if the change speed or amount of change in the accelerator opening is a predetermined value or more, the maximum pressure in the partial discharge state and the normal control set according to the operating state If the deviation from the target oil pressure is less than a predetermined pressure, and if the amount of change in the gear ratio assuming that the accelerator opening has changed by the predetermined opening is greater than or equal to a predetermined value, the accelerator opening and the gear ratio are set to the low side. If the deviation from the kickdown determination accelerator opening for determining whether or not to execute the kickdown that changes to or more, and if the state in which the deviation is less than the predetermined value has not continued for the first predetermined time or longer, the control for setting the discharge state of the oil pump to the partial discharge state has not continued for the second predetermined time or longer. If the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for diagnosis is less than a predetermined pressure, and if the hydraulic pressure supplied to the oil chamber of the pulley that constitutes the continuously variable transmission is adjusted through the high-pressure oil passage If at least one of the conditions is satisfied when the degree of opening of the valve is equal to or greater than the predetermined degree of opening, the target oil pressure setting means, the pressure adjusting means, the discharge state switching means, and the sticking determination means determine sticking. is preferably interrupted.

In this way, the fixation determination is interrupted when at least one of the predetermined interruption conditions described above is satisfied. Therefore, it is necessary to reduce discomfort due to abnormal noise caused by the oil pump being in a partial discharge high pressure state, to protect the hardware constituting the automatic transmission, and to prevent erroneous detection of sticking determination. becomes possible.

Further, in the sticking detection device for an oil pump according to the present invention, after the sticking determination means performs the control to set the oil pump in the partial discharge state, if the hydraulic pressure is equal to or less than the maximum pressure in the partial discharge state, the oil pump is stuck in the full discharge state. If the oil pressure is higher than the maximum pressure in the partial discharge state, it is preferably determined that the oil pressure is stuck in the full discharge state.

In this way, it is possible to accurately determine whether or not the oil pump is stuck in the full discharge state based on the relationship between the oil pressure after the control for the partial discharge state and the maximum pressure in the partial discharge state. can be determined.

In the oil pump fixation detection device according to the present invention, when performing the fixation determination to determine whether the oil pump is stuck in the full discharge state or the partial discharge state, the discharge state switching means changes the discharge state of the oil pump. is set to a full discharge state, the target hydraulic pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the target hydraulic pressure for diagnosis, and the pressure regulating means sets the hydraulic pressure to match the target hydraulic pressure for diagnosis. After that, the discharge state switching means performs control to switch the discharge state of the oil pump from the full discharge state to the partial discharge state, and the fixation determination means performs control to switch from the full discharge state to the partial discharge state. If the hydraulic pressure drops by a specified value or more within a specified period of time, it is determined that the oil pressure is not stuck in the full discharge state. It is preferable to judge

In this case, when the fixation determination is performed to determine whether the oil pump is stuck in the full discharge state or the partial discharge state, control is first performed so that the discharge state of the oil pump is set to the full discharge state. A value higher than the maximum pressure in the partial discharge state is set as a diagnostic target hydraulic pressure for determining whether the oil pump is stuck in the full discharge state or the partial discharge state. The pressure is regulated to match the target oil pressure for use. That is, when the actual hydraulic pressure is increased so as to match the target hydraulic pressure for diagnosis, by controlling the full discharge state, the time required for the partial discharge state in the normal state (that is, when the partial discharge is not stuck) is can be reduced. After that, control is performed to switch the discharge state of the oil pump from the full discharge state to the partial discharge state, and if the oil pressure drops by a predetermined value or more within a predetermined time, it is determined that the oil pressure is not stuck in the full discharge state. If the hydraulic pressure does not decrease by a predetermined value or more, it is determined that the oil is stuck in the full discharge state. Therefore, after the control for switching from the full discharge state to the partial discharge state is performed, it is possible to determine the presence or absence of full discharge sticking in a relatively short time. As described above, it is possible to shorten the time during which the partial discharge state is reached, that is, shorten the time during which abnormal noise may occur in the partial discharge high pressure state.

Further, in the oil pump sticking detection device according to the present invention, the oil pressure reaches a predetermined value within a predetermined time after the sticking determination means performs control to switch the discharge state of the oil pump from the full discharge state to the partial discharge state. If the oil pressure drops below the maximum pressure in the partial discharge state, it is determined that the oil pressure is not stuck in the full discharge state. If the pressure does not drop below the maximum pressure of , it is preferable to determine that the liquid is stuck in the full discharge state.

In this case, after the control is performed to switch the discharge state of the oil pump from the full discharge state to the partial discharge state, the hydraulic pressure drops by a predetermined value or more and the hydraulic pressure drops below the maximum pressure in the partial discharge state within a predetermined time. If it drops, it is determined that the oil pressure is not stuck in the full discharge state, and if the oil pressure does not drop below a predetermined value, or if the oil pressure does not drop below the maximum pressure in the partial discharge state, the oil pressure sticks in the full discharge state. It is determined that That is, determination of full discharge fixation is performed based on the value of the hydraulic pressure in addition to the amount of decrease in the hydraulic pressure. Therefore, it is possible to more reliably determine whether or not the full discharge is stuck in a relatively short period of time (that is, while shortening the holding time in the partial discharge state).

In the oil pump fixation detection device according to the present invention, it is preferable that the fixation determination means sets the predetermined value based on the engine speed and the oil temperature.

By the way, the discharge pressure of the oil pump changes depending on the rotational speed of the engine that drives the oil pump and the oil temperature. In this case, since the predetermined value is set based on the engine speed and the oil temperature, it is possible to more accurately determine whether or not all discharge is stuck.

Further, in the oil pump fixation detection device according to the present invention, when the fixation determination means controls the discharge state of the oil pump to be in the full discharge state, the regulated hydraulic pressure is in the partial discharge state. If the hydraulic pressure rises above the maximum pressure, it is determined that there is no sticking in the partial discharge state, and if the hydraulic pressure does not rise above the maximum pressure in the partial discharge state, it is determined that the oil pressure is stuck in the partial discharge state. preferable.

In this case, when the discharge state of the oil pump is controlled to be in the full discharge state, if the regulated hydraulic pressure rises above the maximum pressure in the partial discharge state, the oil pump is stuck in the partial discharge state. If the hydraulic pressure does not rise above the maximum pressure in the partial discharge state, it is determined that the oil pressure is stuck in the partial discharge state. Therefore, in the normal state (that is, when the partial ejection is not stuck), it is possible to reduce the time required for the partial ejection state by determining whether or not the partial ejection is stuck while maintaining the full ejection state.

In the oil pump sticking detection device according to the present invention, when performing the sticking determination, the target oil pressure setting means gradually sets the target oil pressure for diagnosis with a constant slope to a value exceeding the maximum pressure in the partial discharge state. preferably raised to

In this case, the target hydraulic pressure for diagnosis is gradually increased with a constant slope to a value exceeding the maximum pressure in the partial discharge state so that the actual hydraulic pressure can follow the sticking determination. Therefore, it is possible to prevent erroneous determination by increasing the diagnostic target hydraulic pressure in consideration of the followability (delay) of the hydraulic pressure.

In the oil pump sticking detection device according to the present invention, the target hydraulic pressure setting means raises the target hydraulic pressure for diagnosis to a value exceeding the maximum pressure in the partial discharge state, then holds the target hydraulic pressure for diagnosis, and determines the sticking. Preferably, the means starts to determine whether or not the oil is stuck in the partial discharge state when a predetermined time has passed after the target hydraulic pressure for diagnosis has increased to a value exceeding the maximum pressure in the partial discharge state.

In this case, after the diagnostic target hydraulic pressure is increased to a value exceeding the maximum pressure in the partial discharge state, the diagnostic target hydraulic pressure is held (fixed), and the diagnostic target hydraulic pressure exceeds the maximum pressure in the partial discharge state. After a predetermined period of time has elapsed after the value has been increased, determination of whether or not the liquid is stuck in the partial discharge state is started. Therefore, it is possible to prevent erroneous determination by starting the determination taking into consideration the followability (delay) of the hydraulic pressure.

Further, in the oil pump sticking detection device according to the present invention, the sticking determination means obtains the maximum pressure in the partial discharge state based on the engine speed and the oil temperature, and sets the diagnostic target oil pressure. is preferred.

As described above, the discharge pressure of the oil pump changes depending on the engine speed and the oil temperature. In this case, the maximum pressure in the partial discharge state is obtained based on the engine speed and the oil temperature, and the target oil pressure for diagnosis is set.

According to the present invention, in an oil pump fixation detection device that detects whether or not an oil pump that can be switched between a full discharge state and a partial discharge state is stuck, the actual oil pressure is equal to or less than the required oil pressure immediately after the end of the fixation determination. It is possible to suppress the undershoot that lowers to

It is a figure which shows the structure of the sticking detection apparatus of the oil pump which concerns on embodiment. 1 is a diagram showing a configuration of a continuously variable transmission to which an oil pump sticking detection device according to an embodiment is applied; FIG. It is a figure for demonstrating the sticking detection method (basic operation) by the sticking detection apparatus of the oil pump which concerns on embodiment. FIG. 7 is a diagram for explaining the effect of reducing hydraulic undershoot at the end of fixation determination by the oil pump fixation detection device according to the embodiment; FIG. 5 is a diagram (a diagram showing hydraulic pressure undershoot) for explaining the operation of the sticking detection device for an oil pump according to a comparative example; It is a flowchart which shows the processing procedure of the sticking detection process by the sticking detection apparatus of the oil pump which concerns on embodiment (1st page). It is a flow chart which shows a processing procedure of sticking detection processing by a sticking detection device of an oil pump concerning an embodiment (the 2nd page).

Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In the drawings, the same reference numerals are used for the same or corresponding parts. Further, in each figure, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

First, referring to FIGS. 1 and 2 together, the configuration of an oil pump sticking detection device 1 according to an embodiment will be described. An oil pump sticking detector 1 detects sticking of an oil pump 10 in a full discharge state or a half discharge state (corresponding to a partial discharge state described in claims). Here, a case where the present invention is applied to a continuously variable transmission (CVT) 110 will be described as an example. FIG. 1 is a diagram showing the configuration of an oil pump sticking detection device 1. As shown in FIG. FIG. 2 is a diagram showing a configuration of a continuously variable transmission 110 to which the oil pump sticking detection device 1 is applied.

The continuously variable transmission 110 is connected to, for example, a crankshaft of the engine 160 via a torque converter (not shown), converts driving force from the engine 160, and outputs the converted driving force. The continuously variable transmission 110 has a primary shaft (input shaft) 120 connected to the output shaft of the torque converter, and a secondary shaft (output shaft) 130 arranged parallel to the primary shaft 120 .

A primary pulley 121 is provided on the primary shaft 120 . The primary pulley 121 includes a fixed pulley 121a joined to the primary shaft 120, and a movable pulley (sheave) mounted opposite to the fixed pulley 121a so as to be slidable in the axial direction of the primary shaft 120 and not relatively rotatable. 121b, and is configured such that the distance between the cone surfaces of the pulleys 121a and 121b, that is, the pulley groove width can be changed. On the other hand, a secondary pulley 131 is provided on the secondary shaft 130 . The secondary pulley 131 includes a fixed pulley 131a joined to the secondary shaft 130, and a movable pulley (sheave) mounted so as to face the fixed pulley 131a so as to be slidable in the axial direction of the secondary shaft 130 and not relatively rotatable. 131b, and is configured to change the pulley groove width.

A chain 140 that transmits driving force is stretched between the primary pulley 121 and the secondary pulley 131 . By changing the groove widths of the primary pulley 121 and the secondary pulley 131 to change the winding diameter ratio (pulley ratio) of the chain 140 with respect to the pulleys 121 and 131, the gear ratio is steplessly changed. Assuming that the winding diameter of the chain 140 around the primary pulley 121 is Rp and the winding diameter around the secondary pulley 131 is Rs, the gear ratio i is expressed as i=Rs/Rp. Also, the shift speed is represented by di/dt.

A primary drive oil chamber (hydraulic cylinder chamber) 122 is formed in the primary pulley 121 (movable pulley 121b). On the other hand, a secondary drive oil chamber (hydraulic cylinder chamber) 132 is formed in the secondary pulley 131 (movable pulley 131b). The groove widths of the primary pulley 121 and the secondary pulley 131 are set and changed by adjusting the primary hydraulic pressure introduced into the primary drive oil chamber 122 and the secondary hydraulic pressure introduced into the secondary drive oil chamber 132 .

The hydraulic pressure for shifting the continuously variable transmission 110, that is, the primary hydraulic pressure and secondary hydraulic pressure described above, is controlled by a control valve (valve body). The control valve controls the hydraulic pressure discharged from the oil pump 10 (hereinafter referred to as "line pressure ”) is adjusted and supplied to the primary driving oil chamber 122 and the secondary driving oil chamber 132 of the continuously variable transmission 110 described above. It should be noted that FIG. 1 shows only a part of the circuits of the control valve (the line pressure regulating circuit and the ejection state switching circuit).

The oil pump 10 is driven by the engine output, sucks the oil (ATF) stored in the oil pan through the first intake oil passage 80A and the intake port 106, and raises the pressure to two discharge ports (first discharge port 107A and the second ejection port 107B). As the oil pump 10, for example, a two-port vane pump having two discharge ports is preferably used. It should be noted that it may be configured to have two suction ports so as to correspond to the two ejection ports (the first ejection port 107A and the second ejection port 107B). A first line pressure oil passage 70A (corresponding to a high pressure oil passage described in claims) is connected to the first discharge port 107A, and the oil discharged from the first discharge port 107A is the first line pressure oil. It is pumped to path 70A. On the other hand, a second line oil passage 70B is connected to the second outlet 107B, and the oil discharged from the second outlet 107B is pumped to the second line oil passage 70B. The second line pressure oil passage 70B is configured to communicate with the first line pressure oil passage 70A via the switching control valve 60 (details will be described later).

A line pressure control valve 30 for regulating the hydraulic pressure (discharge pressure) of the oil discharged from the oil pump 10 to the hydraulic pressure (line pressure) required by the continuously variable transmission 110 is provided in the first line pressure oil passage 70A. is provided.

The line pressure control valve 30 is connected to a first control pressure oil passage 91 communicating with a line pressure linear solenoid 20, which will be described later, a first line pressure oil passage 70A, and a drain oil passage 93 for discharging oil. The line pressure control valve 30 accommodates a spool 31 therein so as to be slidable in the axial direction. A spring 32 is provided at the end of the spool 31, and the pushing force (line pressure control pressure x pressure receiving area) by the line pressure control pressure generated by the line pressure linear solenoid 20 and the spring force of the spring 32 ( The amount of oil discharged from the first line pressure oil passage 70A to the drain oil passage 93 is adjusted by driving the spool 31 in the axial direction in accordance with the balance with the biasing force), thereby regulating the line pressure. done.

That is, the line pressure control valve 30 connects the first line pressure oil passage 70A and the drain oil passage 93 when the spring force (biasing force) is greater than the pressing force of the line pressure control pressure. The line pressure is adjusted by discharging the oil in the pressure oil passage 70A through the drain oil passage 93. On the other hand, the line pressure control valve 30 blocks the communication between the first line pressure oil passage 70A and the drain oil passage 93 when the spring force (biasing force) of the spring 32 is smaller than the pushing force of the line pressure control pressure. Then, the discharge of oil from the first line pressure oil passage 70A is stopped.

The line pressure linear solenoid 20 axially displaces the valve according to the current value applied from the transmission control unit (hereinafter referred to as "TCU") 150 based on the line pressure required for the continuously variable transmission 110. and adjusts the line pressure control pressure by adjusting the balance between the supply pressure from the first line pressure oil passage 70A and the drain according to the current applied to the linear solenoid. By supplying the regulated line pressure control pressure to the line pressure control valve 30 through the first control pressure oil passage 91, the line pressure control valve 30 is driven and controlled as described above. Here, as the current value applied to the line pressure linear solenoid 20 increases, the line pressure control pressure increases linearly, and accordingly the actual line pressure also increases linearly.

As described above, the second discharge port 107B of the oil pump 10 communicates with the first line pressure oil passage 70A via the second line pressure oil passage 70B and the switching control valve 60 . Also, the second discharge port 107B of the oil pump 10 directly or indirectly communicates with the first suction oil passage 80A via the second line pressure oil passage 70B, the switching control valve 60, and the second suction oil passage 80B. It is

The switching control valve 60 selects the discharge destination of the oil discharged from the second discharge port 107B based on the spring force (biasing force) of the spring 62 and the pressing force of the switch hydraulic pressure generated by the switch pressure solenoid 50, which will be described later. between the first line pressure oil passage 70A (high pressure oil passage) and the second suction oil passage 80B (low pressure oil passage) that directly or indirectly communicates with the first suction oil passage 80A (suction port 106) to switch.

More specifically, the switching control valve 60 includes a second control pressure oil passage (switch pressure oil passage) 92 communicating with the switch pressure solenoid 50, a first line pressure oil passage 70A, and a second pressure oil passage communicating with the second discharge port 107B. It is connected to the line pressure oil passage 70B and the second suction oil passage 80B that directly or indirectly communicates with the first suction oil passage 80A (suction port 106). The switching control valve 60 accommodates a spool 61 therein so as to be slidable in the axial direction. A _spring 62 is provided at one end of the spool 61 . The spool 61 is driven in the axial direction according to the balance between the pressing force F _SW (switch oil pressure P _SW × pressure receiving area A _SW ) by the switch oil pressure P SW , and the oil communicates with the second line pressure oil passage 70B _. The path is switched between the first line pressure fluid path 70A and the second suction fluid path 80B.

More specifically, the switching control valve 60 communicates the second line pressure oil passage 70B and the first line pressure oil passage 70A when the spring force is greater than the pushing force of the switch oil pressure. , so that the discharge destination of the oil discharged from the second discharge port 107B is the first line pressure oil passage 70A. On the other hand, when the spring force is less than the pushing force of the switch oil pressure, the switching control valve 60 connects the second line pressure oil passage 70B and the second suction oil passage 80B, that is, the second discharge port 107B. is switched so that the discharge destination of the oil discharged from is the second suction oil passage 80B.

Therefore, the switching control valve 60 connects the second line pressure oil passage 70B and the second suction oil passage 80B when the switch oil pressure is supplied from the switch pressure solenoid 50, which will be described later. Switching is performed so that the destination of the oil discharged from the discharge port 107B is the second oil intake passage 80B (to be in a half-discharge state). On the other hand, the switching control valve 60 connects the second line pressure oil passage 70B and the first line pressure oil passage 70A, for example, when the switch oil pressure is not supplied from the switch pressure solenoid 50 (when the switch oil pressure is zero). In other words, the destination of the oil discharged from the second discharge port 107B is switched to the first line pressure oil passage 70A (to be in the full discharge state).

The switch pressure solenoid 50 selects the discharge destination of the oil discharged from the second discharge port 107B based on, for example, the engine torque (the input torque of the continuously variable transmission 110) and the gear ratio of the continuously variable transmission 110. A switch hydraulic pressure (switching hydraulic pressure) for switching between the one-line pressure oil passage 70A and the second suction oil passage 80B (that is, switching between the full discharge state and the half discharge state) is generated. The switch pressure solenoid 50 is connected to the first line pressure oil passage 70A and the second control pressure oil passage (switch pressure oil passage) 92 described above. When the switch pressure solenoid 50 is opened, the supply pressure from the first line pressure oil passage 70A passes through the second control pressure oil passage 92 to one end (the side facing the spring 62) of the switching control valve 60. is supplied as switch hydraulic pressure (switching hydraulic pressure) to the part. On the other hand, by closing the switch pressure solenoid 50, the supply of the switch oil pressure is stopped. At this time, the oil in the second control pressure oil passage 92 is drained, and the switch oil pressure is set to zero.

As the switch pressure solenoid 50, for example, an on/off solenoid that opens when a voltage is applied and closes when the voltage is stopped is preferably used. The relationship between voltage application/stop and valve opening/closing may be reversed (normally open). Opening/closing of the switch pressure solenoid 50 is controlled by the TCU 150 .

A line pressure sensor 153 that detects line pressure (oil pressure) is attached to the first line pressure oil passage 70A. The line pressure sensor 153 is electrically connected to the TCU 150 , and the output of the line pressure sensor 153 , that is, an electrical signal (for example voltage) corresponding to the line pressure is read into the TCU 150 .

In addition to the line pressure sensor 153, the TCU 150 includes a range switch 151 that detects the selected position of the shift lever, and an oil temperature sensor 152 that detects the oil temperature of the continuously variable transmission 110. Sensor is connected. In addition, the TCU 150 includes an engine control unit (hereinafter referred to as "ECU") 170 that comprehensively controls the engine 160 via a CAN (Controller Area Network) 190, and brake control by automatic pressurization and torque of the engine 160. It is connected to a vehicle dynamic control unit (hereinafter referred to as "VDCU") 180 or the like, which controls skidding and ensures vehicle stability during cornering, so as to be able to communicate with each other.

Here, the ECU 170 is connected to a crank angle sensor 171 that detects the position of the crankshaft of the engine 160, an accelerator opening sensor 172 that detects the opening of the accelerator pedal, and the like. The ECU 170 obtains the engine speed from the change in the rotational position of the crankshaft detected by the crank angle sensor 171 . Further, the ECU 170 obtains the engine torque from, for example, the amount of intake air detected by an air flow meter. The ECU 170 transmits information such as engine speed, engine torque, accelerator pedal opening, coolant temperature, etc. to the TCU 150 and the like via the CAN 190 .

On the other hand, the VDCU 180 is connected with a vehicle speed sensor 181 and the like for detecting the rotation speed (vehicle speed) of each wheel of the vehicle. VDCU 180 transmits information such as the detected wheel speed (vehicle speed) to TCU 150 via CAN 190 .

The TCU 150 receives information such as engine speed, engine torque, and accelerator opening from the ECU 170 via the CAN 190 , and also receives information such as vehicle speed from the VDCU 180 . The vehicle speed information may be calculated from the rotation speed of the secondary shaft 130 and the total gear ratio between the secondary shaft 130 and the wheels. Alternatively, a vehicle speed sensor may be connected to the TCU 150 to directly detect the vehicle speed.

The TCU 150 includes a microprocessor that performs calculations, an EEPROM that stores programs and the like for causing the microprocessor to execute various processes, a RAM that stores various data such as calculation results, a backup RAM that retains the stored contents with a battery, And it is configured to have an input/output I/F and the like.

The TCU 150 automatically and steplessly shifts the gear ratio in accordance with the vehicle operating conditions (for example, accelerator pedal opening, vehicle speed, etc.) according to a shift map based on various information acquired from the above-described various sensors and the like. Note that the shift map is stored in EEPROM or the like in the TCU 150 . The TCU 150 also controls the driving of the line pressure linear solenoid 20, the switch pressure solenoid 50, and the like. That is, the TCU 150 adjusts the line pressure and switches the discharge state of the oil pump 10 (full discharge state and half discharge state).

In particular, the TCU 150 determines whether or not the oil pump 10 is stuck in the full discharge state or the half discharge state (that is, the switch pressure solenoid 50 and/or the switching control valve 60 for switching the discharge state is stuck). It has a function to suppress undershoot when the actual oil pressure drops below the required oil pressure immediately after the end (including interruption) of the oil pressure. Therefore, the TCU 150 functionally includes a discharge state switching section 150a, a target hydraulic pressure setting section 150b, a pressure adjusting section 150c, a sticking determination section 150d, a sticking determination prohibiting section 150e, and a storage section 150f. In the TCU 150, a program stored in an EEPROM or the like is executed by a microprocessor to control a discharge state switching section 150a, a target oil pressure setting section 150b, a pressure adjustment section 150c, a fixation determination section 150d, and a fixation determination prohibition section 150e. Each function of is realized.

The discharge state switching unit 150a drives the switch pressure solenoid 50 to change the discharge state of the oil pump 10 between the two discharge ports (first discharge port 107A, second discharge port 107B) and the first line pressure oil passage 70A ( high-pressure oil passage), or the first outlet 107A of the two outlets (first outlet 107A, second outlet 107B) is communicated with the first line pressure oil path 70A, The second discharge port 107B is switched to a semi-discharge state in which the suction port 106 (the first suction oil passage 80A) of the oil pump 10 is directly or indirectly communicated. That is, the ejection state switching portion 150a, the switch pressure solenoid 50, and the switching control valve 60 function as ejection state switching means described in the claims. More specifically, the discharge state switching unit 150a changes the discharge state of the oil pump 10 to full, based on the engine torque (that is, the input torque of the continuously variable transmission 110) and the gear ratio of the continuously variable transmission 110, for example. To switch between a discharge state and a half-discharge state.

The target hydraulic pressure setting unit 150b sets a target hydraulic pressure (target line pressure), which is a control target value for the hydraulic pressure (line pressure) of the first line pressure oil passage 70A. In addition, the target hydraulic pressure setting unit 150b sets the oil pump A target hydraulic pressure for diagnosis is set for determining whether or not 10 is stuck in the full discharge state or the half discharge state. At this time, the target hydraulic pressure setting unit 150b sets a value higher than the maximum pressure in the half-discharge state (half-discharge maximum pressure+predetermined value) as the target hydraulic pressure for diagnosis. In addition, it is preferable that the predetermined value is a value that does not cause an erroneous determination in consideration of various variations. That is, the target hydraulic pressure setting section 150b functions as target hydraulic pressure setting means described in the claims.

More specifically, the diagnostic target hydraulic pressure is preferably set to a value higher than the maximum pressure in the half-discharge state and lower than the maximum pressure in the full-discharge state. Here, the maximum pressure in the half-discharge state and the maximum pressure in the full-discharge state are, for example, maps that define the relationship between engine speed, oil temperature, and each maximum pressure (half-discharge maximum pressure map, full-discharge A maximum discharge pressure map) is stored in advance, and the map can be obtained by searching the map based on the engine speed and the oil temperature. Each maximum pressure increases as the engine speed increases. On the other hand, the higher the oil temperature, the lower each maximum pressure. Note that the target hydraulic pressure setting unit 150b sets the target hydraulic pressure (target line pressure) according to the operating state of the vehicle (for example, vehicle speed, accelerator opening, etc.) when the fixation determination (diagnosis) is not performed, that is, during normal control. do. A map (diagnostic target oil pressure map) that defines the relationship between the engine speed, oil temperature, and target oil pressure for diagnosis is stored in advance, and diagnosis is performed by searching the map based on the engine speed and oil temperature. It is also possible to adopt a configuration in which the target oil pressure for use is directly obtained. The target hydraulic pressure or diagnostic target hydraulic pressure set as described above is output to the pressure regulating section 150c.

Further, the target hydraulic pressure setting unit 150b sets the operating state of the vehicle (for example, , vehicle speed and accelerator opening) is set higher than the normal (during normal control) target oil pressure (for example, higher by a predetermined pressure). That is, the target hydraulic pressure is raised above the normal value.

Furthermore, the target hydraulic pressure setting unit 150 b sets a secondary target hydraulic pressure (corresponding to the pulley target hydraulic pressure), which is a control target value for the hydraulic pressure of the secondary pulley 131 that constitutes the continuously variable transmission 110 . In particular, the target hydraulic pressure setting unit 150b sets the control target value of the hydraulic pressure of the secondary pulley 131, for example, according to the engine torque (input torque) after the execution of the sticking determination is started. A determination-time secondary target hydraulic pressure (equivalent to a determination-time pulley target hydraulic pressure) is set which is higher than the secondary target hydraulic pressure of (for example, higher by a predetermined pressure). That is, the secondary target hydraulic pressure is raised above the normal value. At that time, the secondary target hydraulic pressure may be directly set higher (that is, the secondary target hydraulic pressure at the time of determination may be set), or, for example, the secondary target hydraulic pressure may be increased indirectly by increasing the secondary pressure lower limit value. good too.

On the other hand, the target hydraulic pressure setting unit 150b, when a first predetermined time (for example, 1.0 (sec)) elapses after the operation of accumulating the integral term by the pressure regulating unit 150c, which will be described later, is restarted, The control target value of the hydraulic pressure of the first line pressure oil passage 70A is returned from the determination end target hydraulic pressure to the normal target hydraulic pressure.

Similarly, the target hydraulic pressure setting unit 150b, when a second predetermined time (for example, 0.5 (sec)) elapses after the operation of accumulating the integral term by the pressure regulating unit 150c, which will be described later, is resumed. The control target value of the hydraulic pressure of the secondary pulley 131 is returned from the determination time secondary target hydraulic pressure to the normal secondary target hydraulic pressure. It is preferable to set the second predetermined time shorter than the first predetermined time because it is preferable that the time for increasing the hydraulic pressure of the secondary pulley 131 is short considering the influence on fuel consumption and shifting.

The pressure regulating unit 150c drives the line pressure linear solenoid 20 and controls the actual oil pressure (actual line pressure) to match the target oil pressure or diagnostic target oil pressure. That is, the pressure regulating section 150c functions as pressure regulating means described in the claims. More specifically, the pressure regulating unit 150c performs feedback control based on the deviation between the target hydraulic pressure (or the diagnostic target hydraulic pressure) and the hydraulic pressure (line pressure) of the first line pressure oil passage 70A to adjust the first line pressure The hydraulic pressure of the oil passage 70A is adjusted so as to match the target hydraulic pressure (or diagnostic target hydraulic pressure).

Here, in this embodiment, PID control (Proportional-Integral-Differential Controller) is applied to control the current value of the line pressure linear solenoid 20 . That is, the pressure regulating unit 150c includes a proportional term (P term) proportional to the deviation between the actual hydraulic pressure and the target hydraulic pressure (or diagnostic target hydraulic pressure), an integral term (I term) corresponding to the time integration of the residual deviation, and The current value (control value) of the line pressure linear solenoid 20 is controlled based on the differential term (D term) corresponding to the magnitude of the deviation change.

Here, the integral term (I term) accumulates the residual deviation by integration and reflects it in the current value (control value) of the line pressure linear solenoid 20. Therefore, when the sticking determination is made, the target hydraulic pressure for diagnosis is output in a half discharge state. If the hydraulic pressure is set to a value that is not correct, the deviation will accumulate unnecessarily. Therefore, in particular, when the oil pump 10 is under control to set the discharge state of the oil pump 10 to the half-discharge state at the time of fixation determination, the pressure regulating unit 150c adjusts Temporarily suspends the operation of accumulating the integral term (I term) that adjusts the control value.

On the other hand, the pressure regulating unit 150c performs the stopped integral term accumulation operation (hydraulic pressure feedback) when the actual hydraulic pressure becomes equal to or lower than the target hydraulic pressure at the end of the determination after the execution of the fixation determination is terminated (or interrupted). to resume. The pressure regulating unit 150c stops when the difference between the actual oil pressure and the target oil pressure at the end of determination becomes equal to or less than a predetermined value, or when a predetermined time elapses after execution of the sticking determination is finished. Integral term accumulation (hydraulic feedback) may be restarted. When resuming the temporarily stopped accumulating operation of the integral term (oil pressure feedback control (PID control)), the pressure regulating unit 150c uses the value of the integral term when the accumulating operation is stopped. The accumulation operation of the term (oil pressure feedback control (PID control)) is resumed. Here, the value of the integral term when the operation of accumulating the integral term is stopped is stored in the storage unit 150f.

The fixation determination unit 150d determines whether or not the oil pump 10 is stuck in the full discharge state or the half discharge state. In other words, the fixation determination section 150d functions as fixation determination means described in the claims. Here, a method for detecting sticking in the full discharge state or the half discharge state will be described in detail with reference to FIG. 3 as well. FIG. 3 is a diagram for explaining a sticking detection method (basic operation) by the sticking detection device 1 for an oil pump. An example of changes in pressure and actual oil pressure (actual line pressure) is shown. Note that FIG. 3 also shows a normal target oil pressure (normal target line pressure). The horizontal axis of FIG. 3 is time (sec), and the vertical axis is hydraulic pressure (MPa). In FIG. 3, the actual line pressure (actual oil pressure) is indicated by a solid line, the diagnostic target line pressure is indicated by a dashed line, the maximum pressure in the half-discharge state is indicated by a dotted line, and the target line pressure during normal operation is indicated by a dashed line.

When diagnosing whether the oil pump 10 is stuck in full discharge or stuck in half, first, the discharge state switching unit 150a drives the switch pressure solenoid 50 to set the discharge state of the oil pump 10 to the full discharge state. control (see t1 in FIG. 3).

The target hydraulic pressure setting unit 150b sets a value higher than the maximum pressure in the half-discharge state as the diagnostic target hydraulic pressure. At this time, the target hydraulic pressure setting unit 150b gradually increases the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the half-discharge state with a constant slope so that the actual hydraulic pressure can follow (t1 in FIG. 3). ~ see t2). Here, the constant slope is set according to, for example, the oil temperature and the engine speed, taking into account the followability of the actual oil pressure. Then, the target hydraulic pressure setting unit 150b increases the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the half-discharge state, and then holds (fixes) the diagnostic target hydraulic pressure at that value (t2 to t4 in FIG. 3). reference). The maximum pressure in the half-discharge state can be obtained based on the engine speed and the oil temperature, as described above.

The pressure regulating unit 150c drives the line pressure linear solenoid 20 to control the actual oil pressure to match the diagnostic target oil pressure.

The fixation determination unit 150d determines (diagnoses) whether or not the fuel is stuck in the half-discharge state when a predetermined time has passed after the target hydraulic pressure for diagnosis is increased to a value exceeding the maximum pressure in the half-discharge state. Start. More specifically, when the actual hydraulic pressure rises above the maximum pressure in the half-discharge state (for example, when it substantially matches the target hydraulic pressure for diagnosis), the fixation determination unit 150d determines that there is no fixation in the half-discharge state. (see t2 to t3 in FIG. 3). On the other hand, if the actual oil pressure does not rise above the maximum pressure in the half-discharge state, it is determined that the oil is stuck in the half-discharge state. Note that the determination (diagnosis) of the half-discharge fixation may be omitted.

After completion of the half-discharge fixation diagnosis (if it is determined that there is no half-discharge fixation), the discharge state switching unit 150a drives the switch pressure solenoid 50 to change the discharge state of the oil pump 10 from the full discharge state to the half discharge state. Control to switch to the state is performed (see t3 in FIG. 3).

The fixation determination unit 150d determines whether or not there is a pressure drop of a predetermined pressure or more after the control for switching from the full discharge state to the half discharge state is performed, and/or whether the actual hydraulic pressure is a predetermined pressure (maximum pressure in the half discharge state). Sticking in the full discharge state is determined based on whether or not it has decreased below. That is, if the actual oil pressure drops by a predetermined value or more within a predetermined time period after the control for switching from the full discharge state to the half discharge state is performed, the fixation determination unit 150d determines that there is no fixation in the full discharge state. . On the other hand, if the actual oil pressure has not decreased by a predetermined value or more, it is determined that the oil is stuck in the full discharge state (see t3 to t4 in FIG. 3). At this time, the predetermined time is set according to, for example, the oil temperature and the engine speed, taking into account the followability of the oil pressure when switching to the half-discharge state in the normal state. Further, the predetermined value is determined based on the difference between the diagnostic target hydraulic pressure and the half-discharge maximum pressure, for example, based on the engine speed and the oil temperature, or the difference between the diagnostic target hydraulic pressure and the half-discharge maximum pressure. Set according to the difference.

Further, if the actual oil pressure drops below the maximum pressure in the half-discharge state for a certain period of time after the control for switching from the full-discharge state to the half-discharge state is performed, the fixation determination unit 150d determines that the fixation is not occurring in the full-discharge state. I judge. On the other hand, if the actual oil pressure does not drop below the maximum pressure in the half-discharge state, it is determined that the oil is stuck in the full-discharge state (see t3 to t4 in FIG. 3). Here, it is preferable to set the fixed time to be short within a range that does not reduce the certainty of sticking determination.

Returning to FIG. 1, when at least one of the following interruption conditions (1) to (12) is satisfied, the stiction determination prohibition unit 150e sets the target hydraulic pressure setting unit 150b, Execution of sticking diagnosis by the pressure adjusting unit 150c, the discharge state switching unit 150a, and the sticking determination unit 150d is prohibited or interrupted. In other words, it is determined whether or not the oil pump 10 is stuck, and execution of a series of sequences for detecting sticking of the oil pump 10 is prohibited or interrupted. In other words, the fixation determination prohibition unit 150e functions as a fixation determination prohibition unit recited in the claims.
(1) When the number of revolutions of the engine is a predetermined number of revolutions (for example, 2000 rpm) or more (that is, the pressure (oil pressure) of the oil discharged from the oil pump 10 increases, the flow rate of the discharged oil increases, (if there is a risk of louder sound).
(2) When the temperature of the oil is below a predetermined temperature (for example, 100° C.) (that is, the amount of oil leakage decreases, the pressure (hydraulic pressure) of the oil discharged from the oil pump 10 increases, and the abnormal noise increases. (if there is a risk of becoming).
(3) When the speed of the vehicle is less than or equal to a predetermined speed (eg, 60 km/h) (that is, when wind noise, road noise, etc. are reduced and abnormal noise caused by the oil pump 10 is likely to be relatively increased). ).
(4) The deviation between the average value of the vehicle speed in a predetermined period and the maximum and minimum values of the vehicle speed in a predetermined period (for example, 5 to 10 seconds) is a predetermined speed (for example, ±2 (km/h)) or more. (For example, when the vehicle is not running at a constant speed with the flow of the vehicle group).
(5) If the change rate of the accelerator opening is a predetermined value (that is, for example, 10 (deg/s)) or more (the accelerator pedal is likely to be depressed, and it is estimated that the target hydraulic pressure (required hydraulic pressure) is stable) when it is not possible) (that is, when a drop in oil pressure is likely to occur).
(6) When the deviation between the maximum pressure in the half-discharge state and the target hydraulic pressure for normal control set according to the operating state is less than a predetermined pressure (for example, 0.5 (MPa)) (i.e., the maximum half-discharge If the difference between the pressure and the target hydraulic pressure becomes small and there is a high possibility that the actual hydraulic pressure will decrease and fall below the target hydraulic pressure (required hydraulic pressure) when performing a sticking diagnosis and switching to the half discharge state If the decrease is likely to occur)).
(7) If the amount of change in the transmission gear ratio when it is assumed that the accelerator opening has changed by a predetermined opening (for example, 3 (deg)) is a predetermined value (for example, 0.5) or more (that is, the hydraulic pressure is reduced is likely to occur).
(8) If the deviation between the accelerator opening and the kickdown judging accelerator opening for judging whether or not to execute the kickdown that changes the gear ratio to the low side is a predetermined opening (for example, 5 (deg)) ) (i.e. for driving conditions where kickdown is likely to occur).
(9) When the deviation between the target hydraulic pressure and the actual hydraulic pressure of the high-pressure oil passage is equal to or greater than a predetermined value (for example, 0.2 (MPa)), and the state in which the deviation is less than the predetermined value is maintained for a first predetermined time. (For example, when it does not continue for 3 (sec)) or more (for example, when the target oil pressure cannot be followed due to the occurrence of oil vibration).
(10) When the control to set the discharge state of the oil pump 10 to the half-discharge state does not continue for a second predetermined time (eg, 5 (sec)) or more (for example, when the half-discharge state is set, the oil flow rate is insufficient) (i.e., when the required flow rate (hydraulic pressure) cannot be secured unless full discharge is achieved).
(11) When the deviation between the maximum pressure in the half-discharge state and the diagnostic target hydraulic pressure is less than a predetermined pressure (for example, 0.5 (MPa)) (the deviation between the half-discharge maximum pressure and the diagnostic target hydraulic pressure becomes smaller, when the certainty of the fixation diagnosis is reduced).
(12) The opening of the upshift valve that adjusts the hydraulic pressure supplied to the drive oil chamber 122 of the primary pulley 121 constituting the continuously variable transmission 110 via the first line pressure oil passage 70A is equal to or greater than a predetermined opening (that is, , when the duty ratio of the upshift solenoid is a predetermined value (for example, 70(%)) or more.

Note that when execution of the fixation determination is interrupted by the fixation determination prohibiting unit 150e, the discharge state switching unit 150a, the target oil pressure setting unit 150b, the pressure adjustment unit 150c, and the fixation determination unit 150d suspend the execution of the fixation determination. to return to normal control.

Next, the operation of the oil pump sticking detector 1 will be described with reference to FIGS. FIG. 4 is a diagram for explaining the effect of reducing the hydraulic pressure undershoot at the end of the fixation determination by the oil pump fixation detection device 1 . FIG. 4 shows an example of changes in each oil pressure (MPa), accelerator opening (deg), oil pump discharge amount, current value (A) of the line pressure linear solenoid 20, etc. in order from the top. 6 and 7 are flow charts showing the processing procedure of the fixation detection process by the oil pump fixation detection device 1. FIG. This process is repeatedly executed mainly in the TCU 150 every predetermined time (every 10 ms, for example).

In step S100, the switch pressure solenoid 50 is driven to control the discharge state of the oil pump 10 to be in the full discharge state (see t1 in FIG. 4). Next, in step S102, as a control target value for the hydraulic pressure of the secondary pulley 131, a determination-time secondary hydraulic pressure that is higher by a predetermined pressure than the normal secondary target hydraulic pressure (target secondary pressure) set according to the engine torque (input torque) is set. A target hydraulic pressure (target secondary pressure at determination) is set. That is, the secondary target hydraulic pressure is raised above the normal value. At this time, the secondary pressure lower limit value is gradually increased with a predetermined slope (change amount), thereby indirectly increasing the secondary target hydraulic pressure (secondary target hydraulic pressure during determination) (see t1 in FIG. 4). As the secondary target hydraulic pressure (secondary target hydraulic pressure at determination) increases, the normal target hydraulic pressure is also increased.

Subsequently, in step S104, a value higher than the maximum pressure in the half-discharge state (half-discharge maximum pressure+predetermined value) is set as the diagnostic target hydraulic pressure. At this time, the diagnostic target hydraulic pressure is gradually increased with a constant slope to a value exceeding the maximum pressure in the half-discharge state so that the actual hydraulic pressure can follow. Further, the actual oil pressure is regulated so as to match the diagnostic target oil pressure (see t1 to t2 in FIG. 4).

In step S106, it is determined whether or not the diagnostic target hydraulic pressure has increased (reached) to a value exceeding the maximum pressure in the half-discharge state (half-discharge maximum pressure+predetermined value). Here, if the target hydraulic pressure for diagnosis has not increased to a value exceeding the maximum pressure in the half-discharge state, the process proceeds to step S104, and the target hydraulic pressure for diagnosis reaches a value exceeding the maximum pressure in the half-discharge state. The above-described processing of steps S104 to S106 is repeatedly executed until it rises. On the other hand, when the target hydraulic pressure for diagnosis has increased to a value exceeding the maximum pressure in the half discharge state, the process proceeds to step S108.

When the diagnostic target hydraulic pressure has increased to a value exceeding the maximum pressure in the half-discharge state, in step S108, the diagnostic target hydraulic pressure is held (fixed) at that value (see t2 to t4 in FIG. 4). Then, when a predetermined time has elapsed after the target hydraulic pressure for diagnosis has increased to a value exceeding the maximum pressure in the half-discharge state, it is determined (diagnosed) in step S110 whether or not the hydraulic pressure is stuck in the half-discharge state. be started.

In subsequent step S112, it is determined whether or not the actual oil pressure has exceeded the maximum pressure in the half-discharge state for a certain period of time after the diagnosis is started. Here, when the actual oil pressure exceeds the maximum pressure in the half discharge state for a certain period of time, the process proceeds to step S114. On the other hand, when the actual oil pressure has not exceeded the maximum pressure in the half-discharge state for a certain period of time, the process proceeds to step S140.

When the actual hydraulic pressure exceeds the maximum pressure in the half-discharge state (for example, when it substantially matches the target hydraulic pressure for diagnosis), it is determined in step S114 that there is no fixation in the half-discharge state (see t2 to t3 in FIG. 4). ).

After completion of the half-discharge fixation diagnosis (if it is determined that there is no half-discharge fixation), in step S116, the switch pressure solenoid 50 is driven to switch the discharge state of the oil pump 10 to the half-discharge state. (see t3 in FIG. 4). Also, in S118, the operation of accumulating an integral term (term I) for adjusting the control value according to the time integral of the deviation between the diagnostic target hydraulic pressure and the actual hydraulic pressure is stopped. At that time, the value of the integral term when the accumulation operation is stopped is stored in the storage unit 150f.

Next, in step S120, a determination is made as to whether or not a predetermined interruption condition has been established. Note that the predetermined interruption condition is as described above, so detailed explanation is omitted here. Here, when a predetermined interruption condition is satisfied, the process proceeds to step S130. On the other hand, when the predetermined interruption condition is not satisfied, the process proceeds to step S122.

Then, in step S122, it is determined whether or not the actual oil pressure has decreased by a predetermined value or more within a predetermined time after the control for switching from the full discharge state to the half discharge state (that is, whether or not there has been a pressure drop of a predetermined pressure or more). ) is determined. Here, if the actual oil pressure drops by a predetermined value or more (pressure drop) within a predetermined time, the process proceeds to step S124 (see t3 to t4 in FIG. 4). On the other hand, when the actual oil pressure has not decreased by a predetermined value or more (pressure drop) within the predetermined time, it is determined in step S128 that the oil is stuck in the full discharge state (abnormality determination), and the process proceeds to step S130. Transition.

In step S124, it is determined whether or not the actual oil pressure has fallen below a predetermined pressure (half-discharge maximum pressure) for a certain period of time. Here, if the actual oil pressure drops below a predetermined pressure (half discharge maximum pressure) for a certain period of time, it is determined in step S126 that the oil pressure is not stuck in the full discharge state (normal determination), and then the process proceeds to step S130. Processing proceeds (see t3 to t4 in FIG. 4). On the other hand, when the actual oil pressure does not fall below the predetermined pressure (maximum half-discharge pressure) for a certain period of time, it is determined in step S128 that the full discharge state is stuck (abnormality determination), and then the process proceeds to step S130. do.

In step S130, the fixation diagnosis is terminated, and the control target value of the oil pressure (line pressure) of the first line pressure oil passage 70A is set based on the operating state of the vehicle (for example, vehicle speed and accelerator opening). A target hydraulic pressure at the end of determination is set, which is higher than the target hydraulic pressure by a predetermined pressure. Then, the target hydraulic pressure is gradually increased by a predetermined amount of change (slope) to the end-of-judgment target hydraulic pressure, which is higher than the normal value (see t4 to t5 in FIG. 4).

Next, in step S132, it is determined whether or not the actual oil pressure has become equal to or less than the target oil pressure at the end of determination. Here, when the actual oil pressure becomes equal to or lower than the target oil pressure at the end of determination, the process proceeds to step S138. On the other hand, when the actual oil pressure is not equal to or lower than the target oil pressure at the end of determination, the process proceeds to step S134.

In step S134, it is determined whether or not the difference between the actual oil pressure and the target oil pressure at the end of determination has become equal to or less than a predetermined value. Here, when the difference between the actual oil pressure and the target oil pressure at the end of the determination becomes equal to or less than a predetermined value, the process proceeds to step S138. On the other hand, when the difference between the actual oil pressure and the target oil pressure at the end of determination is not equal to or less than the predetermined value, the process proceeds to step S136.

In step S136, it is determined whether or not a predetermined period of time has elapsed after completion of the fixation determination. Here, if the predetermined time has not elapsed after the fixation determination is completed, the process proceeds to step S132 described above, and step S132 is continued until the condition in step S132, step S134, or step S136 is satisfied. The processing of to S136 is repeatedly executed. On the other hand, if the predetermined period of time has elapsed after completion of the fixation determination, the process proceeds to step S138.

In step S138, the stopped accumulation operation of the integral term (hydraulic feedback) is restarted. At that time, the accumulation operation of the integral term is restarted using the value of the integral term stored in the storage unit 150f (that is, the value when the accumulation operation was stopped) (see t6 in FIG. 4). .

Then, in step S140 , when the first predetermined time has elapsed after the operation of accumulating the integral term is resumed, the control target value of the hydraulic pressure (line pressure) of the first line pressure oil passage 70A changes by a predetermined amount. The target oil pressure at the end of determination is gradually returned to the normal target oil pressure by an amount (slope) (see t7 to t8 in FIG. 4). Similarly, in step S142 , the control target value of the hydraulic pressure of the secondary pulley 131 is gradually changed by a predetermined amount of change (inclination) when the second predetermined time elapses after the operation of accumulating the integral term is restarted. , the secondary target pressure at the time of determination is returned to the normal secondary target pressure (see t7 to t8 in FIG. 4). After that, this processing is temporarily exited.

If step S112 is negative, step S144 further determines whether or not the actual oil pressure is equal to or lower than the maximum pressure in the half-discharge state for a certain period of time. Here, if the actual oil pressure is equal to or lower than the maximum pressure in the half-discharge state for a certain period of time, it is determined in step S146 that the oil pressure is stuck in the half-discharge state (abnormality determination), and then the process proceeds to step S150. Transition. On the other hand, if the actual oil pressure is not equal to or lower than the maximum pressure in the half-discharge state for a certain period of time, it is assumed that the oil pressure is hunting. do.

In step S150, the fixation diagnosis is terminated, and the control target value for the oil pressure (line pressure) of the first line pressure oil passage 70A is set based on the operating state of the vehicle (for example, vehicle speed and accelerator opening). A target hydraulic pressure at the end of determination is set, which is higher than the target hydraulic pressure by a predetermined pressure. That is, the target hydraulic pressure is gradually increased by a predetermined amount of change (inclination) to the target hydraulic pressure at the end of determination, which is higher than the normal value. After that, the process proceeds to step S132 described above. Here, the processing contents of step S132 are as described above, and detailed description thereof will be omitted here.

As described in detail above, according to the present embodiment, when the execution of the fixation determination is terminated (or interrupted), the control target value for the hydraulic pressure (line pressure) of the first line pressure oil passage 70A is: A target hydraulic pressure at the end of determination is set, which is higher than the normal target hydraulic pressure by a predetermined pressure. That is, the target hydraulic pressure is raised by a predetermined pressure from the normal value (see the uppermost part of FIG. 4). Further, according to the present embodiment, after the execution of the fixation determination is started, the determination-time secondary target hydraulic pressure that is higher than the normal secondary target hydraulic pressure by a predetermined pressure is set as the control target value for the hydraulic pressure of the secondary pulley 131 . be. That is, the secondary target hydraulic pressure is raised by a predetermined pressure from the normal value (see the topmost level in FIG. 4). Therefore, for example, as shown in FIG. 4, the accelerator pedal is stepped on substantially at the same time as the fixation determination is completed, and the secondary pulley 131 is accompanied by an increase in engine torque (input torque) and a downshift to the low gear ratio. Even if the required flow rate of oil increases due to an increase in the required hydraulic pressure of the secondary pulley 131 and a change in the volume of the hydraulic chamber of the secondary pulley 131, an undershoot in which the actual hydraulic pressure drops below the required hydraulic pressure immediately after the end of the sticking determination is suppressed. It becomes possible to

FIG. 5 shows the operation of the sticking detector for an oil pump according to the comparative example. FIG. 5 shows, as a comparative example, the operation (actual oil pressure, etc.) when raising the target oil pressure (setting the target oil pressure at the end of judgment) and raising the secondary target oil pressure (setting the secondary target oil pressure at the time of judgment) are not performed. movement). If the target hydraulic pressure is not raised (set the target hydraulic pressure at the end of determination) and the secondary target hydraulic pressure is not raised (set the secondary target hydraulic pressure at determination), for example, the accelerator pedal is depressed substantially at the same time as the fixation determination is completed. In this case, the required hydraulic pressure of the secondary pulley 131 increases as the engine torque (that is, the input torque of the continuously variable transmission 110) increases and the gear ratio is downshifted to the low side. The required oil flow rate (secondary required flow rate) increases according to the increase in the required hydraulic pressure of the secondary pulley 131 and the change in the volume of the hydraulic chamber of the secondary pulley 131 . However, if the pump discharge flow rate cannot cover the required oil flow rate (secondary required flow rate) at that time, an undershoot occurs in which the actual oil pressure drops below the required oil pressure (see the hatched portion in FIG. 5). ).

According to the present embodiment, when the fixation determination for determining whether or not the oil pump is stuck is executed, if control is being performed to set the discharge state of the oil pump 10 to the partial discharge state, the diagnostic Accumulation of the integral term that adjusts the control value according to the time integral of the deviation between the target hydraulic pressure and the hydraulic pressure is temporarily stopped, and after the execution of the sticking determination is completed, the hydraulic pressure becomes equal to or less than the target hydraulic pressure at the end of the determination. , the stopped accumulation operation of the integral term is resumed. Therefore, after the sticking determination is completed, the integral term accumulation operation (hydraulic feedback) does not resume until the hydraulic pressure drops below the target hydraulic pressure at the end of determination. It can prevent unnecessary accumulation. As a result, it is possible to suppress the undershoot of the hydraulic pressure immediately after the end of the fixation determination.

According to the present embodiment, when the difference between the hydraulic pressure and the target hydraulic pressure at the end of determination becomes equal to or less than a predetermined value, or when a predetermined time has elapsed after execution of the sticking determination is completed, the engine is stopped. Integral term accumulation is resumed. Therefore, even if the hydraulic pressure does not drop below the target hydraulic pressure at the end of determination, the operation of accumulating the integral term can be resumed. Therefore, it is possible to prevent the operation of accumulating the integral term from continuing to stop (that is, from being unable to restart the hydraulic feedback).

According to the present embodiment , when the first predetermined time has passed after the operation of accumulating the integral term is restarted, the control target value of the hydraulic pressure of the high-pressure oil passage changes from the target hydraulic pressure at the end of determination to the normal target hydraulic pressure. returned to Therefore, after suppressing the undershoot of the hydraulic pressure, it is possible to smoothly shift to the normal control.

According to the present embodiment , when the second predetermined time elapses after the operation of accumulating the integral term is resumed, the control target value of the hydraulic pressure of the secondary pulley 131 changes from the secondary target hydraulic pressure at the time of determination to the normal secondary target hydraulic pressure. returned to hydraulic pressure. Therefore, after suppressing the undershoot of the hydraulic pressure, it is possible to smoothly shift to the normal control.

Furthermore, according to the present embodiment, the fixation determination is interrupted when at least one of the predetermined interruption conditions described above is satisfied. Therefore, it is possible to reduce discomfort due to abnormal noise caused by the oil pump 10 being in a half-discharge high pressure state, to protect the hardware constituting the automatic transmission, and to prevent erroneous detection of sticking determination. becomes possible.

On the other hand, according to the present embodiment, when the fixation determination is performed to determine whether the oil pump 10 is stuck in the full discharge state or the half discharge state, first, the discharge state of the oil pump 10 is changed to the full discharge state. A value higher than the maximum pressure in the half-discharge state is set as the diagnostic target oil pressure for determining whether the oil pump 10 is stuck in the full-discharge state or the half-discharge state. The hydraulic pressure of the first line pressure oil passage 70A (high pressure oil passage) is regulated so as to match the target hydraulic pressure for diagnosis. That is, when the actual hydraulic pressure is increased so as to match the target hydraulic pressure for diagnosis, by controlling the full discharge state, the time required for the half discharge high pressure state in the normal state (that is, when the half discharge is not stuck) is can be reduced. Thereafter, control is performed to switch the discharge state of the oil pump 10 from the full discharge state to the half discharge state, and when the hydraulic pressure drops below the maximum pressure in the half discharge state, it is determined that the oil pump 10 is not stuck in the full discharge state. If the hydraulic pressure does not fall below the maximum pressure in the half-discharge state, it is determined that the oil is stuck in the full-discharge state. Therefore, it is possible to determine the presence or absence of full-discharge sticking in a relatively short time after the control for switching from the full-discharge state to the half-discharge state is performed. As described above, it is possible to shorten the time during which the fuel is in the half-discharge state and the high-pressure state, that is, shorten the time during which abnormal noise is generated in the half-discharge and high-pressure state.

Further, according to the present embodiment, after the control for switching the discharge state of the oil pump 10 from the full discharge state to the half discharge state is performed, the hydraulic pressure drops by a predetermined value or more and the hydraulic pressure is reduced to half within a predetermined time. If the pressure drops below the maximum pressure in the discharge state, it is determined that the oil pressure is not stuck in the full discharge state. In this case, it is determined that the liquid is stuck in the full discharge state. That is, determination of full discharge fixation is performed based on the value of the hydraulic pressure in addition to the amount of decrease in the hydraulic pressure. Therefore, it is possible to more reliably determine whether or not the full discharge is stuck in a relatively short period of time (that is, while shortening the holding time in the half-discharge state). At that time, since the predetermined value is set based on the engine speed and the oil temperature, it is possible to more accurately determine whether or not all discharge is stuck.

Further, according to this embodiment, when the discharge state of the oil pump 10 is controlled to be the full discharge state, if the regulated hydraulic pressure exceeds the maximum pressure in the half discharge state, It is determined that there is no sticking in the half-discharge state, and if the hydraulic pressure does not rise beyond the maximum pressure in the half-discharge state, it is determined that the oil is stuck in the half-discharge state. Therefore, in the normal state (that is, when the half-discharge is not stuck), it is possible to reduce the time required for the half-discharge state by determining whether or not the half-discharge is stuck while maintaining the full-discharge state.

Further, according to the present embodiment, after the diagnostic target hydraulic pressure is increased to a value exceeding the maximum pressure in the half-discharge state, the diagnostic target hydraulic pressure is held (fixed), and the diagnostic target hydraulic pressure is set to the half-discharge state. When a predetermined time elapses after the pressure rises to a value exceeding the maximum pressure, it is determined whether or not the liquid is stuck in the half-discharge state. Therefore, erroneous determination can be prevented by starting the determination taking into account the followability (delay) of the actual oil pressure.

According to the present embodiment, the target hydraulic pressure for diagnosis is gradually increased with a constant slope to a value exceeding the maximum pressure in the half-discharge state so that the actual hydraulic pressure can follow the sticking determination. Therefore, by increasing the diagnostic target hydraulic pressure in consideration of the followability (delay) of the actual hydraulic pressure, erroneous determination can be prevented.

Further, according to the present embodiment, the maximum half-discharge pressure is obtained based on the engine speed and the oil temperature, and the target oil pressure for diagnosis is set. Become.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and various modifications are possible. For example, in the above embodiment, by setting the target hydraulic pressure (target hydraulic pressure at the end of determination) higher than normal and setting the secondary target hydraulic pressure (secondary target hydraulic pressure at determination) higher than normal, the sticking Although the undershoot of the hydraulic pressure after diagnosis is suppressed, only one of the methods may be executed.

In the above embodiment, the case where the present invention is applied to a continuously variable transmission (CVT) 110 has been described as an example, but the present invention can also be applied to a stepped automatic transmission (Step AT), DCT, and the like. can. Further, in the above embodiment, the present invention is applied to the chain-type continuously variable transmission (CVT) 110, but instead of the chain-type continuously variable transmission, for example, a belt-type continuously variable transmission, a toroidal type It can also be applied to a continuously variable transmission or the like.

In the above embodiment, the two-port oil pump 10 having two discharge ports 107A and 107B was described as an example, but instead of the two-port oil pump 10, an oil pump having three or more discharge ports may be used. Further, in the above embodiment, a vane pump is used as the oil pump 10, but instead of the vane pump, for example, an internal gear type gear pump, a trochoid pump, or the like can be used.

Note that the partial discharge state is not limited to the half discharge state, and may be an operating state in which the discharge amount (capacity) is smaller than that in the full discharge state.

In the above embodiment, an ON/OFF solenoid is used as the switch pressure solenoid 50, but instead of the ON/OFF solenoid, for example, a duty solenoid, a linear solenoid, or the like may be used.

In the above embodiment, two methods (that is, a method using the hydraulic pressure value and a method using the hydraulic pressure drop amount (decrease range)) are used in combination to determine sticking in the full discharge state. A configuration using only one method may be used. In the above embodiment, the diagnostic target hydraulic pressure (and actual hydraulic pressure) is increased in the full discharge state, but the diagnostic target hydraulic pressure (and actual hydraulic pressure) may be increased in the half discharge state.

In the above embodiment, an example of the numerical value (threshold value) of each condition for interrupting the fixation diagnosis was shown, but the numerical value (threshold value) of each condition is not limited to the above embodiment, and the required requirements, etc. can be arbitrarily set according to Further, it may be configured such that it is determined whether or not to interrupt the fixation determination only in the half-discharge state.

Reference Signs List 1 oil pump fixation detection device 10 oil pump 106 suction port 107A first discharge port 107B second discharge port 20 line pressure linear solenoid 30 line pressure control valve 50 switch pressure solenoid 60 switching control valve 70A first line pressure oil passage 70B 2-line pressure oil passage 80A first suction oil passage 80B second suction oil passage 91 first control pressure oil passage 92 second control pressure oil passage 93 drain oil passage 110 continuously variable transmission 121 primary pulley 122 primary drive oil chamber 131 secondary Pulley 132 Secondary drive oil chamber 150 TCU
150a discharge state switching unit 150b target oil pressure setting unit 150c pressure regulating unit 150d sticking determination unit 150e sticking determination prohibiting unit 150f storage unit 151 range switch 152 oil temperature sensor 153 line pressure sensor 160 engine 170 ECU
171 crank angle sensor 172 accelerator opening sensor 180 VDCU
181 vehicle speed sensor 190 CAN

Claims (14)

an oil pump that boosts the pressure of the oil sucked from the suction port and discharges it from the plurality of discharge ports;
The discharge state of the oil pump is a full discharge state in which all of the plurality of discharge ports communicate with the high-pressure oil passage, or a portion of the plurality of discharge ports communicates with the high-pressure oil passage, and a discharge state switching means for switching to a partial discharge state in which another part of the discharge port communicates with the suction port of the oil pump;
target hydraulic pressure setting means for setting a target hydraulic pressure that is a control target value of the hydraulic pressure of the high-pressure oil passage;
pressure regulating means for performing feedback control based on the deviation between the target hydraulic pressure and the hydraulic pressure of the high-pressure oil passage to adjust the hydraulic pressure of the high-pressure oil passage to match the target hydraulic pressure;
fixation determination means for determining whether the oil pump is stuck in a full discharge state or a partial discharge state based on the hydraulic pressure regulated by the pressure regulating means;
When executing the sticking determination to determine whether the oil pump is stuck,
Instead of the target hydraulic pressure, the target hydraulic pressure setting means sets a diagnostic target hydraulic pressure for determining whether the oil pump is stuck in the full discharge state or the partial discharge state. set a high value for
The discharge state switching means controls the discharge state of the oil pump to be in a partial discharge state,
The pressure regulating means adjusts the hydraulic pressure so that it matches the target hydraulic pressure for diagnosis, and when control is being performed to set the discharge state of the oil pump to a partial discharge state, the target hydraulic pressure for diagnosis and the target hydraulic pressure for diagnosis. Temporarily suspending the accumulation operation of the integral term that adjusts the control value according to the time integral of the deviation from the hydraulic pressure,
The fixation determination means determines whether or not the oil pump is stuck in the full discharge state, based on the relationship between the oil pressure after the control for the partial discharge state and the maximum pressure in the partial discharge state. death,
When execution of sticking judgment is completed,
The target hydraulic pressure setting means sets, as a control target value for the hydraulic pressure of the high-pressure oil passage, a target hydraulic pressure at the end of determination that is higher than a normal target hydraulic pressure that is set based on the operating state of the vehicle;
After execution of sticking determination is completed,
The pressure regulating means resumes the stopped operation of accumulating the integral term when the hydraulic pressure becomes equal to or lower than the target hydraulic pressure at the end of the determination,
The target hydraulic pressure setting means sets the control target value of the hydraulic pressure of the high-pressure oil passage to the control target value of the hydraulic pressure of the high-pressure oil passage at the time of the end of the determination when a predetermined time has passed after the operation of accumulating the integral term by the pressure regulating means is resumed. An oil pump sticking detection device characterized by returning from a target oil pressure to a normal target oil pressure. The target hydraulic pressure setting means further sets a pulley target hydraulic pressure, which is a control target value of the hydraulic pressure of the pulleys constituting the continuously variable transmission,
After execution of sticking determination is started,
2. The target hydraulic pressure setting means sets, as the control target value of the hydraulic pressure of the pulley, a determination-time pulley target hydraulic pressure that is higher than a normal pulley target hydraulic pressure that is set according to engine torque. 2. The sticking detection device for the oil pump according to . an oil pump that boosts the pressure of the oil sucked from the suction port and discharges it from the plurality of discharge ports;
The discharge state of the oil pump is a full discharge state in which all of the plurality of discharge ports communicate with the high-pressure oil passage, or a portion of the plurality of discharge ports communicates with the high-pressure oil passage, and a discharge state switching means for switching to a partial discharge state in which another part of the discharge port communicates with the suction port of the oil pump;
target hydraulic pressure setting means for setting a target hydraulic pressure, which is a control target value of the hydraulic pressure of the high-pressure oil passage, and setting a pulley target hydraulic pressure, which is a control target value of the hydraulic pressure of the pulleys constituting the continuously variable transmission;
pressure regulating means for performing feedback control based on the deviation between the target hydraulic pressure and the hydraulic pressure of the high-pressure oil passage to adjust the hydraulic pressure of the high-pressure oil passage to match the target hydraulic pressure;
fixation determination means for determining whether the oil pump is stuck in a full discharge state or a partial discharge state based on the hydraulic pressure regulated by the pressure regulating means;
When executing the sticking determination to determine whether the oil pump is stuck,
Instead of the target hydraulic pressure, the target hydraulic pressure setting means sets a diagnostic target hydraulic pressure for determining whether the oil pump is stuck in the full discharge state or the partial discharge state. set a high value for
The discharge state switching means controls the discharge state of the oil pump to be in a partial discharge state,
The pressure regulating means adjusts the hydraulic pressure so that it matches the target hydraulic pressure for diagnosis, and when control is being performed to set the discharge state of the oil pump to a partial discharge state, the target hydraulic pressure for diagnosis and the target hydraulic pressure for diagnosis. Temporarily suspending the accumulation operation of the integral term that adjusts the control value according to the time integral of the deviation from the hydraulic pressure,
The fixation determination means determines whether or not the oil pump is stuck in the full discharge state, based on the relationship between the oil pressure after the control for the partial discharge state and the maximum pressure in the partial discharge state. death,
After execution of sticking determination is started,
The target hydraulic pressure setting means sets, as a control target value of the hydraulic pressure of the pulley, a determination-time pulley target hydraulic pressure that is higher than a normal pulley target hydraulic pressure that is set according to engine torque;
When execution of sticking judgment is completed,
The target hydraulic pressure setting means sets, as a control target value for the hydraulic pressure of the high-pressure oil passage, a target hydraulic pressure at the end of determination that is higher than a normal target hydraulic pressure that is set based on the operating state of the vehicle;
After execution of sticking determination is completed,
The pressure regulating means resumes the stopped operation of accumulating the integral term when the hydraulic pressure becomes equal to or lower than the target hydraulic pressure at the end of the determination,
The target hydraulic pressure setting means sets the control target value of the hydraulic pressure of the pulley to the target pulley hydraulic pressure at the time of determination when a predetermined time elapses after the operation of accumulating the integral term by the pressure regulating means is resumed. An oil pump sticking detection device, characterized in that it restores the normal pulley target hydraulic pressure from the pulley target pressure. The pressure regulating means also stops when the difference between the hydraulic pressure and the target hydraulic pressure at the end of determination becomes equal to or less than a predetermined value, or when a predetermined time elapses after execution of the sticking determination is completed. 2. An oil pump sticking detection device according to claim 1, wherein the operation of accumulating an integral term that has been performed is restarted. The pressure regulating means also stops when the difference between the hydraulic pressure and the target hydraulic pressure at the end of determination becomes equal to or less than a predetermined value, or when a predetermined time elapses after execution of the sticking determination is completed. 4. An oil pump sticking detection device according to claim 3, wherein the operation of accumulating the integral term which has been performed is restarted. Further comprising fixation determination prohibition means for interrupting execution of fixation determination for determining whether or not the oil pump is stuck,
The fixation determination prohibiting means includes:
When the number of revolutions of the engine that drives the oil pump is equal to or higher than a predetermined number of revolutions,
When the temperature of the oil is below a predetermined temperature,
If the speed of the vehicle is less than or equal to the predetermined speed,
When the deviation between the average value of the vehicle speed in the predetermined period and the maximum value and the minimum value of the vehicle speed in the predetermined period is equal to or greater than the predetermined speed,
If the rate of change or the amount of change in the accelerator opening is greater than or equal to a predetermined value,
If the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for normal control set according to the operating state is less than the predetermined pressure,
If the amount of change in the gear ratio when it is assumed that the accelerator opening has changed by a predetermined opening is greater than or equal to a predetermined value,
When the deviation between the accelerator opening and the kickdown determination accelerator opening for determining whether or not to execute kickdown to change the gear ratio to the low side is less than a predetermined opening,
When the deviation between the target hydraulic pressure and the actual hydraulic pressure of the high-pressure oil passage is equal to or greater than a predetermined value, and when the state in which the deviation is less than the predetermined value has not continued for a first predetermined time or longer,
When the control for setting the discharge state of the oil pump to the partial discharge state has not continued for a second predetermined time or longer,
When the deviation between the maximum pressure in the partial discharge state and the target hydraulic pressure for diagnosis is less than a predetermined pressure,
When the degree of opening of the valve that adjusts the oil pressure supplied to the oil chamber of the pulley that constitutes the continuously variable transmission via the high-pressure oil passage is equal to or greater than a predetermined degree of opening,
When at least one of the conditions is satisfied, the execution of the sticking determination by the target oil pressure setting means, the pressure adjusting means, the discharge state switching means, and the sticking determination means is interrupted. The sticking detection device for an oil pump according to any one of claims 1 to 5. The fixation determination means determines that the oil pressure is not stuck in the full discharge state when the hydraulic pressure is equal to or less than the maximum pressure in the partial discharge state after the control for the partial discharge state is performed, and the oil pressure reaches the maximum pressure in the partial discharge state. 7. An oil pump fixation detection device according to claim 1, wherein if the pressure is higher than the pressure, it is determined that the oil pump is stuck in the full discharge state. When performing fixation determination to determine whether the oil pump is stuck in the full discharge state or the partial discharge state,
The discharge state switching means performs control to set the discharge state of the oil pump to a full discharge state,
The target hydraulic pressure setting means sets a value higher than the maximum pressure in the partial discharge state as the diagnostic target hydraulic pressure,
The pressure regulating means adjusts the hydraulic pressure so that it matches the diagnostic target hydraulic pressure,
after that,
The discharge state switching means performs control to switch the discharge state of the oil pump from a full discharge state to a partial discharge state,
The fixation determination means determines that the oil pump is stuck in the full discharge state when the hydraulic pressure drops by a predetermined value or more within a predetermined time after the control for switching the discharge state of the oil pump from the full discharge state to the partial discharge state is performed. The sticking detection of the oil pump according to any one of claims 1 to 7, wherein it is determined that there is no oil pressure, and if the hydraulic pressure does not decrease by a predetermined value or more, it is determined that the oil pump is stuck in the full discharge state. Device. The fixation determining means determines that the oil pressure drops by a predetermined value or more within a predetermined time after the control for switching the discharge state of the oil pump from the full discharge state to the partial discharge state is performed, and the oil pressure is in the partial discharge state. If the pressure drops below the maximum pressure, it is determined that the oil pressure is not stuck in the full discharge state. 9. An oil pump sticking detection device according to claim 8, wherein it is determined that the oil pump is sticking in a discharging state. 10. The oil pump fixation detection device according to claim 8, wherein the fixation determination means sets the predetermined value based on an engine speed and an oil temperature. The fixation determining means determines that when the regulated oil pressure rises beyond the maximum pressure in the partial discharge state when the discharge state of the oil pump is controlled to be in the full discharge state, the partial discharge state is reached. and if the hydraulic pressure does not rise above the maximum pressure in the partial discharge state, it is determined that the oil pressure is stuck in the partial discharge state. 3. A fixation detection device for an oil pump according to claim 1. 8. The target hydraulic pressure setting means gradually increases the target hydraulic pressure for diagnosis with a constant slope to a value exceeding the maximum pressure in the partial discharge state when performing the sticking determination. 12. The sticking detection device for an oil pump according to any one of 11 to 11. The target hydraulic pressure setting means holds the diagnostic target hydraulic pressure after increasing the diagnostic target hydraulic pressure to a value exceeding the maximum pressure in the partial discharge state,
The fixation determination means starts to determine whether or not fixation occurs in the partial discharge state when a predetermined time has elapsed after the target hydraulic pressure for diagnosis was increased to a value exceeding the maximum pressure in the partial discharge state. 13. The sticking detector for an oil pump according to claim 12, wherein: 14. The fixation determination means according to any one of claims 1 to 13, wherein the maximum pressure in the partial discharge state is obtained based on the engine speed and the oil temperature, and the target hydraulic pressure for diagnosis is set. 3. A fixation detection device for an oil pump according to claim 1.

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